A robust interference mitigation technique for BFSK Fast Frequency Hopped signals

This paper presents an improvement to the Frequency Shift Keying - Fast Frequency Hopping demodulator, which provides increased resilience to interference with a very slight complexity increase. The additional robustness against jamming is achieved by jointly observing the FSK demodulator branches. This allows the proposed demodulator to distinguish the jammer from the signal more accurately. This demodulator is particularly robust for the case of high J/S (Jammer to Signal Ratio), while for the case of low J/S its performance is in line with state-of-the-art receivers.

[1]  Kwok Hung Li,et al.  Multitone jamming rejection of FFH/BFSK self-normalizing receiver , 1998, IEEE Military Communications Conference. Proceedings. MILCOM 98 (Cat. No.98CH36201).

[2]  Catherine M. Keller,et al.  Clipped diversity combining for channels with partial-band interference. II. Ratio-statistic combining , 1989, IEEE Trans. Commun..

[3]  C. Waylan.  Detection of Fast, Noncoherent, Frequency-Hopped FSK , 1975, IEEE Trans. Commun..

[4]  Li Shaoqian,et al.  A new anti-jam receiver for MFSK/FFH system with multitone jamming , 2008, 2008 11th IEEE Singapore International Conference on Communication Systems.

[5]  Yi-Chen Chen.  Optimum and joint-suboptimum maximum-likelihood detection for FH/BFSK in multitone jamming , 2006, CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006..

[6]  Marvin K. Simon,et al.  Spread Spectrum Communications Handbook , 1994 .

[7]  Catherine M. Keller,et al.  Clipped Diversity Combining for Channels with Partial-Band Interference - Part I: Clipped-Linear Combining , 1987, IEEE Transactions on Communications.

[8]  John G. Proakis,et al.  Digital Communications , 1983 .

[9]  Don J. Torrieri.  Frequency Hopping with Multiple Frequency-Shift Keying and Hard Decisions , 1984, IEEE Trans. Commun..

[10]  Kwok Hung Li,et al.  Performance study of a maximum-likelihood receiver for FFH/BFSK systems with multitone jamming , 1999, IEEE Trans. Commun..

[11]  A. J. Viterbi.  A Robust Ratio-Threshold Technique to Mitigate Tone and Partial Band Jamming in Coded MFSK Systems , 1982, MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications.